Overhead power lines with voltage up to 1 kV. Dimensions, intersections and convergence

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 2. Sewerage of electricity

Overhead power lines with voltage up to 1 kV. Dimensions, intersections and convergence

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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2.4.55. The vertical distance from the VLI wires to the surface of the earth in populated and uninhabited areas to the ground and roadways of streets must be at least 5 m. It can be reduced in hard-to-reach areas to 2,5 m and in inaccessible areas (mountain slopes, rocks, cliffs) - up to 1 m.

When crossing impassable parts of streets with branches from overhead lines to building entrances, the distance from the self-supporting insulation system to the sidewalks of pedestrian paths can be reduced to 3,5 m.

The distance from self-supporting insulated wires and insulated wires to the ground surface on branches to the input must be at least 2,5 m.

The distance from bare wires to the ground surface on branches to inputs must be at least 2,75 m.

2.4.56. The distance from the overhead line wires in populated and uninhabited areas with the greatest sag of the wires to the ground and roadways must be at least 6 m. The distance from the wires to the ground can be reduced in hard-to-reach areas to 3,5 m and in inaccessible areas (mountain slopes , rocks, cliffs) - up to 1 m.

2.4.57. The horizontal distance from self-supporting insulated wires at their greatest deviation to elements of buildings and structures must be no less than:

1,0 m - to balconies, terraces and windows;
0,2 m - to the blank walls of buildings, structures.

It is allowed to pass overhead lines and overhead lines with insulated wires over the roofs of buildings and structures (except as specified in Chapters 7.3 and 7.4), and the vertical distance from them to the wires must be at least 2,5 m.

2.4.58. The horizontal distance from overhead line wires at their greatest deviation to buildings and structures must be no less than:

1,5 m - to balconies, terraces and windows;
1,0 m - to blank walls.

The passage of overhead lines with uninsulated wires over buildings and structures is not allowed.

2.4.59. The shortest distance from SIP and overhead line wires to the surface of the earth or water, as well as to various structures when overhead lines pass over them, is determined at the highest air temperature without taking into account heating of the overhead line wires by electric current.

2.4.60. When laying along the walls of buildings and structures, the minimum distance from the SIP should be:

with horizontal laying
above the window, front door - 0,3 m;
under the balcony, window, cornice - 0,5 m;
to the ground - 2,5 m;
with vertical laying
to the window - 0,5 m;
to the balcony, front door - 1,0 m.

The clear distance between the SIP and the wall of the building or structure must be at least 0,06 m.

2.4.61. The horizontal distances from the underground parts of supports or grounding conductors of supports to underground cables, pipelines and ground-based columns for various purposes must be no less than those given in Table 2.4.4.

Table 2.4.4. The smallest permissible horizontal distance from the underground parts of supports or grounding devices of supports to underground cables, pipelines and above-ground columns

Proximity object	Distance, m
Water, steam and heat pipelines, gas distribution pipelines, sewer pipes	1
Fire hydrants, wells, sewer manholes, standpipes	2
Cables (except for communication, signaling and wire broadcasting cables, see also 2.4.77)	1
The same, but when laying them in an insulating pipe	0,5

2.4.62. When crossing overhead lines with various structures, as well as with streets and squares of populated areas, the intersection angle is not standardized.

2.4.63. Crossing overhead lines with navigable rivers and canals is not recommended. If it is necessary to perform such an intersection, overhead lines must be constructed in accordance with the requirements of 2.5.268 - 2.5.272. When crossing non-navigable rivers and canals, the shortest distances from the overhead line wires to the highest water level should be at least 2 m, and to the ice level - at least 6 m.

2.4.64. The intersection and convergence of overhead lines with voltages up to 1 kV with overhead lines with voltages above 1 kV, as well as the joint suspension of their wires on common supports must be carried out in compliance with the requirements given in 2.5.220 - 2.5.230.

2.4.65. It is recommended to cross overhead lines (VLI) up to 1 kV with each other on cross supports; their intersection in the span is also allowed. The vertical distance between the wires of intersecting overhead lines (VLI) must be at least: 0,1 m on the support, 1 m in the span.

2.4.66. In places where overhead lines up to 1 kV cross each other, intermediate supports and anchor-type supports can be used.

When crossing overhead lines up to 1 kV in a span, the intersection location should be chosen as close as possible to the support of the upper intersecting overhead line, while the horizontal distance from the supports of the intersecting overhead line to the wires of the crossed overhead line at their greatest deviation should be at least 2 m.

2.4.67. With parallel passage and proximity of overhead lines up to 1 kV and overhead lines above 1 kV, the horizontal distance between them must be no less than those specified in 2.5.230.

2.4.68. Joint suspension of overhead line wires up to 1 kV and bare overhead line wires up to 20 kV on common supports is permitted subject to the following conditions:

1) Overhead lines up to 1 kV must be carried out according to the design climatic conditions of overhead lines up to 20 kV;

2) wires of overhead lines up to 20 kV should be located above the wires of overhead lines up to 1 kV;

3) overhead line wires up to 20 kV, fixed to pin insulators, must have double fastening.

2.4.69. When hanging overhead line wires up to 1 kV and protected overhead line wires 6-20 kV on common supports, the following requirements must be met:

1) Overhead lines up to 1 kV must be carried out according to the design climatic conditions of overhead lines up to 20 kV;

2) the wires of overhead lines 6-20 kV should be located, as a rule, above the wires of overhead lines up to 1 kV;

3) the fastening of 6-20 kV overhead line wires on pin insulators must be reinforced.

2.4.70. When crossing an overhead line (VLI) with an overhead line with a voltage higher than 1 kV, the distance from the wires of the crossing overhead line to the crossed overhead line (VLI) must comply with the requirements given in 2.5.221 and 2.5.227.

The cross section of the wires of the crossed overhead line should be taken in accordance with 2.5.223.

See other articles Section Rules for the installation of electrical installations (PUE).

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